Question about headphones

Latley ive been experiencing a more flat and distorted sound with my HD 448 Sennheiser. So I am wondering if there is anything I could do about it, I believe they are also out of warranty. Its over 2 years since I bought them.

The sound is especially low and distorted during vocals, almost like there is a "room effect" on. Ive tried different sources as well, so the issue is not the input.

Thoughts anyone?

It sounds like there could be a problem with the cabling, if it is what I think you are talking about. If you have a spare pair of headphones around, try slowly plugging them into a low output audio device like an ipod. Don't plug it all the way in. If you get that same effect the problem is a connection one. (I'm thinking you are hearing that "out of phase" type of sound, no?).

As for the distortion, unfortunately I think that can mean you have been turning them up to loud, or adding some kind of bass kick through an equalizer. Those can be dangerous for headphones--even expensive ones.

found the reciept and its still within warranty, so I nag and get a new one :D